US1518364A - Furnace grate - Google Patents

Description

2 Sheets-Shea?) 1 TIIIIIII Illlllil W. SCHELLENBERG Dec. 9, 1 924.

FURNACE GRATE Filed Aug. l 1922 Dec. 1924 1,518,364

W. SCHELLENBERG FURNACE GRATE Filed Aug. 1, 1922 2 Sheets-Sheet 2 Qwwenfor:

Patented Dec. 9, 1924,

UNITED STATES WALTHER SCHELLENBERG, 0F BARMEN-RITTERSHAUSEN, GERMANY.

FURNACE GRATE.

Application filed August 1, 1922.

To all whom it may concern.-

Be it known that I, VALJHER SCHELLEN- nuns, a citizen of Germany, residing at Barmen-Rittershausen, Germany, have invented certain new and useful Improvements in Furnace Grates, of which the following is a specification.

My invention relates to furnace grates and more especially to grates of the kind in which transverse grate bars provided with openings are arranged in a series in such manner that they form longitudinal passages or channels with slots leading to the furnace.

It is an object of the present invention to increase the grate bars in height a little in front of the furnace bridge, the slots formed by these grate bars having a. direction opposite to that of the draught of the furnace gases. By this means the introduction of jets of steam and air ordinarily employed in connection with other kinds of grates and acting in the opposite direction to the fuel gases may be readily carried out by making use of grates of the type mentioned provided with transverse grate bars.

The drawings illustrate, by way of example, a form of embodiment of the invention as applied to a double flue boiler, in which Figure 1 represents an end elevation and Figure 2 represents a longitudinal section.

Figures 3 to 6 show further forms of construction according to the invention in longitudinal or cross-section, respectively.

Referring to the drawings, the grate consists of the usual grate bars a arranged in a series transversely to the longitudinal direction of the furnace, the bars forming groups of air passages 7), whence slots 0, preferably substantially fan-shaped, lead to the surface of the grate. According to the invention the grate bars near the furnace bridge cl are so shaped that their upper surfaces rise towards the furnace bridge 0?. The slots 0 in this part of the grate are curved in such a way that the jets or currents of steam or air passing through them are directed away from the furnace bridge, that is oppositely to the direction of flow of the fuel gases.

In order to regulate the admission of the air or steam to the grate, or toenable sections of the grate to be completely closed against the admission of air, control nozzles f are provided upon the steam inlet pipe 0 Serial No. 578,994.

in front of each passage Z), and by means of which the quantity of steam or air admitted may be adjusted in accordance with the fuel conditions.

In the construction shown in Figure 3 the grate consists, as in the construction according to Figures 1 and 2, of grate bars a arranged in a series transversely to the longitudinal direction of the furnace, the grate bars forming air passages I), from which fan-shaped or elongated lanceolate slots extend to the surface of the grate. The upwardly sloping end f of the grate, adjacent the furnace bridge cl, is made in one piece as differentiated from the construction according to Fig. 2, which simplifies very considerably the manufacture and the mounting and removal of this part of the grate. The upwardly directed slots 0 provided in this block f are straight. The longitudinal passages of the block f are connected by short transverse passages 9, so that, upon the passage of the air to one or other of the longitudinal passages b being interrupted, the rear part of the grate nevertheless received air from the other longitudinal passages along its whole width.

In the construction according to Figure 4 the grate bars are provided with separate passages cl, through which the air may pass, if in consequence of the energy produced by the current of combustion air passing through the passages Z) the air becomes rarefied and the process of combustion in the forward part of the grate is thus prejudicially influenced. By the arrangement of the passages cl, which are preferably nozzleshaped, it becomes possible to regulate the process of combustion in the forward part of the grate to the greatest possible extent.

Figures 5 and 6 show in cross-section and in plan View respectively a special forma tion of the end f of the grate which is adjacent tothe furnace bridge. The grate bars a in this modification are not formed in one piece with the block 7, but are distinct from the block and are loosely inserted into the block from above. This arrangement has the advantage that it is possible to readily insert and withdraw damaged grate bars without the necessity of disassembling the entire block.

The invention is susceptible of various other modifications and alterations both in the construction as well as in the arrangement of parts in order to adapt the invention to a variety of different uses and to suit varying operating conditions, and Without deviating from the spirit of the invention as set forth and defined in the claims as hereunto appended.

I claim 1. A furnace comprising a grate and bars forming said grate and extending transversely thereof, said bars having lateral excavations and a plurality of transverse openings, the excavations of contiguous bars forming transverse slots opening into the upper surface of the grate, While the openings of the several bars register With each other and form longitudinal passages extending transversely to and communicating with said slots and a plurality of simi lar bars increasing in height arranged at the end of said grate, the longitudinal passages in said latter bars being interconnected by transverse passages.

2. A furnace comprising a grate and bars forming said grate and extending transversely thereof, said bars having lateral excavations and a plurality of transverse openings, the excavations of contiguous bars forming transverse slots opening into the upper surface of the grate, While the openings of the several bars register with each other and form longitudinal passages extending transversely to and communicating with said slots auxiliary ports extending through the bottom portion of said grate into said passages, and a plurality of similar bars increasing in height arranged at the end of said grate, the longitudinal pas sages in said latter bars being iutercmiueeted by transverse passages.

In testimony whereof I aflix my signature VALTHER- SCHELLENBERG.

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